function hideDiv() {
    if (document.getElementById) { // DOM3 = IE5, NS6 
        document.getElementById('hideshow').style.visibility = 'hidden';
    }
    else {
        if (document.layers) { // Netscape 4 
            document.hideshow.visibility = 'hidden';
        }
        else { // IE 4 
            document.all.hideshow.style.visibility = 'hidden';
        }
    }
}

function showDiv() {
    if (document.getElementById) { // DOM3 = IE5, NS6 
        document.getElementById('hideshow').style.visibility = 'visible';
    }
    else {
        if (document.layers) { // Netscape 4 
            document.hideshow.visibility = 'visible';
        }
        else { // IE 4 
            document.all.hideshow.style.visibility = 'visible';
        }
    }
}